Here's an interesting patent from Canon uncovered by Canon News.

This application details in camera focus stacking and the effect of image stabilization during the multiple exposures required to do the stacking. The area of concern for R&D is how to deal with the possibility of the plane of focus shifting because of camera shake, and how to calculate the amount of shift during various degrees of camera shake.

In camera focus stacking could be a great feature for Canon shooters.

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